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Improvement Properties of Cohesion-Less Soil Using Recycled Bassanite



Author(s)

Masaki Kobayashi1, Aly Ahmed2 and Keizo Ugai3

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DOI:10.17265/1934-7359/2013.12.011

1. Environmental Business Department, DC Co., Ltd., Tokyo 210-005, Japan
2. Civil Engineering Department, Beni-Suef University, Beni-Suef 62512, Egypt
3. Civil and Environmental Engineering Department, Gunma University, Gunma 376-8515, Japan

Solid waste management is a serious problem over the world. Therefore, reduction, re-use and recycling of waste have become major issues in recent days. Gypsum waste plasterboard is considered one example of these waste materials. This study evaluates the use of recycled bassanite, which is derived from gypsum waste plasterboard, to enhance the performance of two types of cohesion-less soil. Recycled bassanite was utilized as a stabilizing agent to improve both compressive and splitting strengths of the tested soil. The effect of bassanite content, soil type, water content and curing time were investigated to explore the behavior of treated soil with recycled bassanite. Test results showed that increase of bassanite content is associated with increase in optimal moisture content, while no significant increase in the dry unit weight was observed. Both compressive and splitting tensile strengths enhanced with the additives of recycled bassanite. The increase of bassanite content had a more significant effect on the compressive strength compared with the effect on tensile strength. The use of recycled bassanite to enhance the strength of sandy soil had a more significant effect compared with silty soil. The effect of curing time on the strength of treated samples was more significant in early curing ages compared with late curing ages. The strength decreased significantly in case of stabilized samples prepared with water content at the wet-side of the compaction curve. However, insignificant decrease in the strength of the stabilized sample was detected with moisture content at the dry-side of compaction curve. This research meets the challenges of our society to reduce the quantities of gypsum wastes, producing useful material from waste materials that will help to a sustainable society.

Soil stabilization, compressive strength, recycled bassanite, cohesion-less soil, splitting strength.